Material is engulfed directly by the cell by
A. diffusion.
B. osmosis.
C. phagocytosis.
D. active transport.
C. phagocytosis.
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Which of the following statements regarding smooth muscle versus striated muscle is false?
A. Calcium for skeletal muscle contraction enters the cell from the sarcoplasmic reticulum and through voltage-gated calcium channels in the plasma membrane, whereas the calcium for smooth muscle contraction enters the cell from the sarcoplasmic reticulum only. B. Smooth muscle contraction is regulated by the binding of calcium to calmodulin, whereas skeletal muscle contraction is regulated by the troponin-tropomyosin system. C. Smooth muscle is activated by the autonomic nervous system, whereas skeletal muscle is activated by the somatic nervous system. D. Separate enzymes mediate the binding of myosin to actin through phosphorylation and dephosphorylation in smooth muscle, whereas the myosin heads of skeletal muscle function as enzymes themselves to hydrolyze ATP. E. Smooth muscle contracts longer and relaxes more slowly compared to skeletal muscle.
Which of the following is not part of the axial skeleton?
A. pelvic girdle B. ribs C. skull D. sternum E. vertebral column
Assume that a massive land bridge is formed between two continents, allowing a variety of species to expand their range. What might be an important evolutionary result of this?
a. This will place too much pressure on habitat, which will cause mass extinctions. b. The influx of new species would place too much pressure on the environment and evolution would cease. c. Resources will not be available to support evolutionary events. d. Cross-mating of species would drive them to extinction. e. Species will diversify as they undergo adaptive radiation.
Cancer is the number one cause of death in the US.
a. true b. false